High Energy Astroparticle Physics

We give a brief (and highly incomplete) overview of the current experimental and theoretical status of high energy cosmic rays and their secondary gamma-rays and neutrinos. We focus on the role of large scale magnetic fields and on multi-messenger aspects linking these three channels. We also recall that the flavor composition of neutrino fluxes from astrophysical sources contains information on both the source conditions and neutrino physics.
Comment: 6 papes, 2 figures, proceedings of plenary talk at the Neutrino Oscillation Workshop (NOW 2006), Conca Specchiulla, Italy, September 9-16, 2006